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From: Optimization of operating parameters of earth air tunnel heat exchanger for space cooling: Taguchi method approach
Factor
Parameter
Level
L1
L2
L3
L4
A
Diameter of pipe (m)
0.10
0.15
0.20
0.25
B
Length of pipe (m)
30
40
50
60
C
Inlet air velocity (m/s)
2
3
4
5
D
Inlet air temperature (K)
307.35
311.35
315.35
319.35